Hi Diego,

I'm not sure you can do that with Ruby's standard Matrix class, but= you surely can do it using SciRuby's NMatrix:

require 'nmatrix'

n =3D NMatrix.random(5) = # Create a 5x5 matrix of random float values.

m =3D n[1 .. 3, 1 .. 3] =A0 =A0 =A0 =A0 =A0 =A0# Select a square = matrix centered around n[2,2].

And then you can print the matrices with:

n.pp
m.pp

You can read more about= the project in the official website=A0http= ://sciruby.com/=A0or on the GitHub page=A0https://github.com/sciruby/nmatrix.

If you have any questions, please direct them= at SciRuby's mailing list:

https://groups.google.com/forum/#!forum/sciruby-dev

See you,

-----

Carlos Agarie

Soft= ware Engineer @ Geekie (= geekie.com.br)

+55 11 97320-3878

@carlos_agarie

2013/7/16 Diego N. <= ;lists@ruby-forum= .com>

Hi!
I'm looking for a way to get part of matix: eg:
my matrix:
[10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29]
[30, 31, 32, 33, 34, 35, 36, 37, 38, 39]
[40, 41, 42, 43, 44, 45, 46, 47, 48, 49]
[50, 51, 52, 53, 54, 55, 56, 57, 58, 59]
[60, 61, 62, 63, 64, 65, 66, 67, 68, 69]
[70, 71, 72, 73, 74, 75, 76, 77, 78, 79]
[80, 81, 82, 83, 84, 85, 86, 87, 88, 89]
[90, 91, 92, 93, 94, 95, 96, 97, 98, 99]

How could i get part ( square ) of the matrix? If i choose the number
54, i would like to get the numbers [43,44,45,53,55,63,64,65], a 3x3
square.

I'm trying to understand the doc (
http://ruby-doc.org/stdlib-1.9.3/libdoc/matrix/rdoc/Matr= ix.html ).

There's a method to get this?

thanks,
Dieog

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